Escapement device.



A. J. CHATNAT.

ESCAPEMENT DEVICE.

APPLICATION FILED SEPT. 14 1917.

1 373,734. Patented July 23, 1918.

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ANDRE JULIEN GHAiNA'I', or rears, rnnnen.

ESOAPEMENT DEVICE.

Specification of Letters Patent.

Patented July 23, 1918.

Application filed September 14., 1917. Serial No. 191,442.

To all whom it may concern:

Be it known that I, ANDRI'J JULinN CI-IAiNAT, manufacturer, a citizen ofthe French Republic, residing at Paris, France, have invented certainnew and useful Improvements in Eseapement Devices, of which thefollowing is a specification.

The invention relates to esca-pement devices adapted to stop at giventime intervals and for a given period, the rotation of a spindle or thelike, and it relates particularly to those spindles of speedometerswhich control the hands.

This invention comprises a spindle carrying thereon a cylindrical diskprovided on its periphery with an even number of fin gers arrangedalternately on each of its faces, and another spindle having securedthereto two cylindrical disks, comprising on the periphery of theiropposite faces, projections, each of the projections of one disk beingarranged opposite to, and having the same width as, the intervalseparating two projections of the other disk, the said disks eing ofsuch dimensions and so arranged that the fingers of the disk are adaptedto register respectively and alternately with the intervals between theprojections of the corresponding disk.

In combination with this main arrangement, the invention comprises otherfeatures, more particularly pointed out in the claims.

An escapement, according to this invention,is shown in. perspective inthe single figure of the drawing.

A spindle (z is rotated in the direction of the arrow 00, by a clockworknot shown in the drawing, and another spindle Z) parallel to the spindlea, has a tendency to rotate in the direction of the arrow g for example,under the action of a spring barrel, (not shown in the drawing).

The spindle a is provided with a pair of cylindrical disks 0 and 0 ofthe same diameter, each of these disks having on the periphery of one ofits faces, projections 0 and 0 so arranged, and of such dimensions, thatwhen the two disks 0 and 0 are placed face to face, each of theprojections of one of the disks is opposite to, and of the same widthas, the interval 0 or 0 separating two projections of the other disks.

The two disks 0 and 0 are secured to the spindle (Z in that position andare separated from each other by a suitable interval. An-

other cylindrical disk (Z is provided on the spindle 5 having on itsperiphery any desired even number of fingers (Z and (Z ar rangedalternately on each of its faces and at suitable distances apart. Thefingers (Z of the said disk (Z are adapted to engage with the intervals0 between the projections 0 of the disk (2, and the fingers (Z with theinterval 0 between the projections 0 of the disk 0 Preferably, thediameters of the disks 0 and 0 are the same, and the diameters of saiddisks and of the disk (Z are so related that the sum of the squares ofthe radii of the disks 0 and 0 should be approximately equal to thesquare of the distance between the two spindles (L and 6. Moreover, theprojections and the intervals separating the same, are so arranged that,when one of the fingers of the disk (Z is opposite to an intervalbetween the projections of the disks 0 or 0 and engages between the saidtwo projections, there is at the opposite side of the disks 0 r 0 suchan interval as to allow of the passage of the finger of the disk (Zwhich then passes through the said intervals.

The operation of the escapement is as fol lows:

The spindle (6 being rotated in a continuous and uniform manner by theclockwork, brings alternately in front of the fingers of the disk (Z,the intervals separating the respective projections of the disks 6 and clVhen an interval, for instance 0 comes in front of a finger (Z of thedisk (Z, the said finger which prevented the spindle Z) from turning byresting against the pro jection 0 preceding the said interval, entersthe same interval, and thus allows the spindle (Z to rotate until a.finger (Z of the disk (Z comes into contact with the projec tion 0 ofthe disk 0 When the interval 0 following the said projection 0 arrivesopposite the finger (Z the spindle Z) is given a further rotation, untilthe finger (Z of the disk (Z engages with a projection 0 of the disk 0and so on.

Obviously, by varying the number and the dimensions of the projectionsand fingers of the various disks, it is possible to bring about anintermittent rotation of the spindle Z) at any given equal or unequaltime intervals, and for any given period of time.

The arrangement regulating the movement of rotation of the spindle a, inthe present case a clockwork, has to supply only the g V r V j w 71,273,734

small amount of power sufiicient to overcome the friction between thefingers of the disk (Z and the projections of the disks andc Moreover,as the momentum stored by the spindle 6 during its movement, is absorbedby the shock of the fingers of its disk a'gainst thecorrespondingprojections of the disks 0 and 0 and produces on the same a reactionwhich passes through the axis of the spindle a, the bearings of whichbear thewhole strain, it follows that there is no tangential reactionwhich is liable to increase or reduce-the force of the regulating motionand consequently aii'ect regular running of the'spindle a.

Obviously the invention is not limited to the construction described,but comprises any modification within the scope of the claims. Thespindle a may be the driving spindle, spindle, provided that thedimensions of the projections and of the intervals between theprojections are suitably chosen. 7 Having now particularly described andascertained the nature of my said invention and'in what manner the sameis to be per formed, I declare that what I claim is r 1. An escapementcomprising a spindle carrying thereon a cylindrical diskv provided onits periphery with an even number of fingers arranged alternately oneach s of its faces, and another spindle having-Se cured thereto twocylindrical disks 'compris ing on the periphery of their opposite faces,projections, the projections of one disk being arranged opposite to,same width as, the interval separating two projections of the otherdisk, the said disks being of such dimensions, and so arranged, that thefingers of thedisk are adapted to engagerespectively and alternatelywith the intervals between the projections of the corresponding disk. 7

Copies of this pat ent may be obtained for five cents each, byaddressing the Commissioner of atents,

' pair being and the spindle b the, regulating and having the 7 2. Anescapement comprising a spindle carrying a diskohaving an even number offingers arranged alternately on its opposite faces, and a second spindlecarrying a pair oi-disks having projections on their opposing faces, theprojections on one disk of the opposite to the intervals he'- tweentheprojections on the other disk of the V pair, and the diameters of thedisks of said pair being the same and the distance-between the spindlesand the diameters of the disks on the two spindles being so related thatthe sum of the squares of the radii of the first named disk and one ofthe disks ofsaid pair is substantially equal tofthe square of suchdistance. o

3. An escapement comprising a pair of rotatable spindles, a membercarried by one of said spindles and having sets of annu:

larly spaced teeth projecting from opposite faces thereofithespacing'ofthe teeth of one set alternating with the spacing of the teeth of theother set, and a pair or adjacently ,located members carried by theother splndle and between whichv the periphery of the member firstmentioned projects, the membersof said pair having projections on theiradjacent faces, the projections on one of the members of said pa r 7being opposite to the intervals betweenthe projectionson the othermember of said pair, and the-projections on the members of said pairbeing arranged to cooperate respectively with the respective sets ofteeth on the member first mentioned.v j

In testimony whereof I have hereunto set my hand in presence of twosubscribing witnesses; a L r I *ANDRE'JUEIEN cHAiN r. [n s] Witnesses: V

Josnrrr GEMENiL, EUGENE PILLEYL Washington, D. 6.?

